I have a 2003 Pontiac Grand Am. Earlier this year

I have a 2003 Pontiac Grand Am. Earlier this year it began having starting problems and I learned that the fuel pump was not turning on sometimes when i put the ignition switch to on. (wouldnt hear it) This didnt seem to be a problem since I would just cycle the ignition switch off and on until i heard the fuel pump turn on. However, one day i lost all power while driving and had to get a tow. The mechanic told me that is was my fuel pump and I had that replaced. It worked perfect for about a month and now the same thing is starting to happen; at times the fuel pump doesnt always come on so the car wont start. I have checked the relay, ignition switch, etc, and obviously they did this when i had it towed in as well. Do you have any ideas what this could be? I cant believe that it would be a bad fuel pump considering it worked fine for a month and now the same problem as before has come back. Thanks

Dave